Volume at about 10 to 11 o'clock or less depending on volume needed, never more than that because the distortion gets to be too much.
Treble at about 11-12 o'clock
Mid at about 11-12 o'clock
Bass at about 12-1 o'clock

Mid switch set to the lowest setting, I think it's 300 Hz.

Ultra Low off
Ultra Hi off

Tone control on my Jazz bass on 4 or 5.

That's about it. I go for an older type thuddy sound. I basically run it practically flat, with just a little boost on the Bass and a little cut on the Mids and Treble.

Volume/Master- depend on the room/situation-
(I also LOVE this head for recording-just the thing to rid one of that tweaky digital thru-the board
Direct sound-just double a track thru the V4 & a great cab, like my SVT 4x8, haha)
But I digress-
Treble at about 11O'clock, Bass about 1 O'Clock-
Mid frequency at 3, then Mids dialed down to about
10 O'Clock- All subject to tweaking with the conditions as well as some signal enhancement-
Hey there, a BOSS LMB-3 can do some sh***!
Now then, besides all the big fun on your axe or signal chain-you have (3) magic buttons-
ULTRA High /Low which do what they do-I use mostly the UL for flavor, AND- push that tiny little presence button on the back of the amp- with a horn cab JEESH! Glass-Beautiful Ampeg brittle fullness-Man you cannot believe how good that damn thing sounds, and if you Ultra High it too, damn, you got sweeeetness.
In conclusion- I like this amp head- it's the TUBES talking!!

I did a thread a bit back on original vs. SLM Ampeg-differences in electronics & sound-No less an authority than Psycho Bass Guy generously contributed as well as others.
There's a lot of reverence for the vintage SVT's etc-maybe justifiably.
But sonically, I AM diggin' the new clean-assD )
VB4H , along with my NOS SVT-48HE cabinet!
TUBES! TUBES! TUBES!
Sorry for that outburst...
They are so....RICH!

Reply to Nomadic Herder: There are no diffrence between those two amp besides the apperance.. They just change the look on the amp like 98-99-00
or something.. but i got a REAAAAALLY fresh unscrathed V-4B! It rauks!

Yes, there is discerning intelligent life on this planet as you have proven by showing and PLAYING thru the V4BH (BH-secret code for "Better Head" than
just about anything!!)
SVT- Tops, too much, though.
Eden, G-K, Ashdown, etc- Sorry You just do not have tubes-You don't-You are wanna-be's!
Aguilar- Yes, nice, but who the &*&^%$ do you think you are charging that kind of $$? Huh?
Do you think you sound better? Well, brudda, You do Not!

Hey-What cab is your head sitting on?
It's a Classic, and that is the right choice!
I copped a no-longer made new SVT-48HE
4x8 w/ tweeter! Well, I rule. It rules. Sounds better
than sex.

BTW, I had covers made for my cab & head- first class all the way-padded, velcro-ed excellent!
Let me know if you are interested & I'll list the source.
V4BH! V4BH! V4BH!
(You want one, don't you? You Should!)

Porno-It looks great- The Classic series cabs match up with the Classic series heads, dimensionally, cosmetically, and most important of all-sonically!!!
Ampeg has a tonal characteristic inherent that is...
AMPEG...and it is very very GOOOOOD!

Cb-I went to buy the V4 head-the shop had it in a demo rack- I started playing (after the TUBES!
warmed up !)and went kinda like...what the &*^% is THAT! It was so nice!
The 4x8's should never have been discontinued.
They cover the range beautifully-The attack
(the cab allows you to plug with or w/out the horn)
with the "presence" switched on the V4 & the horn is I guarantee unlike anything out there- It has a glassy sheen that is gorgeous.
The transients of a 4x8 cover the Hz spectrum as well-I don't play 5-string, but I do play an active bass, and the lows get way-down deep and very round & smooth-I've heard better than a 4x10-
There's been threads on this cab and I can say, If anyone sees one for sale-do yourself a biggie & snatch it up-A great addition.Another plus is size/weight-the unit is very compact and rolls nicely on casters-BIG sound, little hassle.
Obviously, I love this rig-I use it primarily as a second-track for recording and it sings-but I can't help but take it to some live gigs as well.
It gets volume and headroom to spare-100 tube watts is a lot-No its not an SVT, different-and the tone-well, we know about that don't we?!!